Faulty Signal
Faulty signal
Checking connector
- Ignition off.
- Check the mass air flow (MAF) sensor connector. Check for contact resistance and oxidation.
Other information
- Information about combined diagnostic trouble codes (DTCs) Information About Combined Diagnostic Trouble Codes (DTCs)
- Checking wiring and terminals Checking Wiring And Terminals
Continue - Checking mass air flow (MAF) sensor signal
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Checking mass air flow (MAF) sensor signal
- Start engine and run to normal operating temperature.
- Switch of all large power consuming components, for example the air conditioning (A/C) compressor, defroster and seat heaters.
- Read off the air mass. Check that the air mass is within its various ranges at different engine speeds (RPM) according to Mass air flow (MAF) sensor Specifications.
Are these values OK?
Yes - DONE
No - Checking component
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Checking component
Check for air leakage in the intake system. Check in particular the hose between mass air flow (MAF) sensor and throttle body (TB) for leakage and damage according to Check for air leaks in the intake system Air Leaks in the Intake System, Checking.
Check the function of the crankcase ventilation. In particular, check for obstructions and deposits.
Hint: The flame trap may need separating and cleaning to achieve full flow in the system.
Remedy as necessary.
Other information:
- Signal specification Signal Description / Specification
Continue - Verification
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Verification
- Start engine and run to normal operating temperature.
- Switch of all large power consuming components, for example the air conditioning (A/C) compressor, defroster and seat heaters.
- Read off the air mass. Check that the air mass is within its various ranges at different engine speeds (RPM) according to Mass air flow (MAF) sensor Specifications.
Are these values OK?
Yes - DONE
No - Fault-tracing information
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Fault-tracing information
Information
Fault-tracing information
The fault should have been detected and remedied. As this is not the case fault-tracing has failed.
Exit fault-tracing for this diagnostic trouble code (DTC) or make another attempt.
Do you want to exit fault-tracing?
Yes - FAULT-TRACING FAILED
No - Attempt New Test
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Attempt New Test - Checking connector
FAULT-TRACING FAILED - FAULT-TRACING FAILED
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